WATER SUPPLY SYSTEM AND CONTROL METHOD FOR WATER SUPPLY SYSTEM

• Main Authors: YAMASHITA EIGO, ITO TOMOHIRO, YANAGAWA HIDEAKI, SAKATANI TETSUNORI, WATANABE SHOTA
• Format: Patent
• Language: English; Japanese
• Published: 22.02.2021
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

To provide a water supply system capable of shifting to automatic operation using a normal pressure sensor by promptly and surely detecting abnormality of a pressure sensor, and a control method for the water supply system.SOLUTION: A water supply system detects/stores every time a small water quantity time operation frequency f0 in the case where each of pump devices is stopped in a small water quantity state. In the case where the quantity of supplied water is decreased and an operating pump is to be stopped in the small water quantity state, a pressure deviation that is a deviation of signal levels between a first pressure sensor and a second pressure sensor is calculated. In the case where the pressure deviation is equal to or greater than a predetermined pressure deviation ▵h decided beforehand, a frequency deviation (f) between the small water quantity time operation frequency f0 and an initial small water quantity time operation frequency f0' of the pump is further calculated. In the case where the frequency deviation (f) is equal to or greater than a predetermined frequency deviation ▵f decided beforehand, sensor switch processing is performed for controlling operation of the pump device using a second discharge pressure which is detected by the second pressure sensor.SELECTED DRAWING: Figure 8 【課題】迅速かつ確実に圧力センサの異常を検出して正常な圧力センサによる自動運転に移行できる給水装置及び給水装置の制御方法を提供する。【解決手段】実施形態にかかる給水装置は各ポンプ装置が小水量停止した際の小水量時運転周波数ｆ０を、毎回、検出・記憶するとともに、給水量が減少して運転ポンプを小水量停止する際に、第１圧力センサと第２圧力センサの信号レベルの偏差である圧力偏差を算出し、当該圧力偏差が予め定めた所定の圧力偏差△ｈ以上であった場合、さらに、小水量時運転周波数ｆ０と、該当ポンプの初回小水量時運転周波数ｆ０'との周波数偏差ｆを算出し、当該周波数偏差ｆが予め定めた所定の周波数偏差△ｆ以上であった場合に、前記第２圧力センサで検出される第２吐出圧力を用いて前記ポンプ装置の運転制御を行うセンサ切替処理を行う。【選択図】 図８